ExtractAssociatedIcon - 在 PowerShell ISE 中工作正常，但在控制台中不起作用

Question

I have a Powershell Script, Which Contains:

$Path = 'c:\windows\system32\notepad.exe'
$Icon = [System.Drawing.Icon]::ExtractAssociatedIcon($Path)

$Icon.ToBitmap().Save('C:\icon.png')

I write those script in the ' PwerShell ISE ' when I run, it work's fine, and not problem show's up.

But when saving those script, and run by right click on ' icon.ps1 ' then ' Run With PowerShell ' it will get this error:

PS D:\My PowerShell\tmp> .\icon.ps1
Unable to find type [System.Drawing.Icon].
At D:\My PowerShell\tmp\icon.ps1:2 char:9
+ $Icon = [System.Drawing.Icon]::ExtractAssociatedIcon($Path)
+         ~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : InvalidOperation: (System.Drawing.Icon:TypeName) [], RuntimeException
    + FullyQualifiedErrorId : TypeNotFound

You cannot call a method on a null-valued expression.
At D:\My PowerShell\tmp\icon.ps1:4 char:1
+ $Icon.ToBitmap().Save('C:\icon.png')
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : InvalidOperation: (:) [], RuntimeException
    + FullyQualifiedErrorId : InvokeMethodOnNull

Answer 1

You need to load the System.Drawing assembly before you run the rest of the script. At the beginning of the script, put this line:

Add-Type -AssemblyName System.Drawing

This will load the assembly first, allowing the rest of the script to access the methods and members of that assembly.

https://docs.microsoft.com/en-us/powershell/module/microsoft.powershell.utility/add-type?view=powershell-7.1